Glaucoma is one of the eye diseases that can seriously damage your vision. And like hypertension, once diagnosed, the cap will never come off (except for some cases of secondary glaucoma). So its treatment and observation will also be long-term. However, there are some patients with glaucoma whose eye pain symptoms are often not obvious and only chronic vision loss exists due to chronic high intraocular pressure. These patients often lack regularity in treatment, or even go untreated for a long time, and are only seen when there is a significant loss of vision, when serious irreversible damage to vision has already occurred. We know that the WHO defines the criteria for blindness as having a best-corrected visual acuity of less than 0.05 or a central visual field of less than 10 degrees. One of the most striking features of glaucoma is the presence of visual field changes. When these patients feel a significant decrease in central vision, there is often a significant visual field deficit, and in severe cases, a tubular visual field may appear (even some patients still have a central vision of 1.0 at this time). Recently, our hospital has seen several patients with chronic angle-closure glaucoma, all of whom were diagnosed with irregular treatment and finally felt significant vision loss or visual field defects before they were seen again, when their visual function had already been significantly impaired. It is a great pity. Through these real lessons, we should realize the danger of glaucoma, and it is important to emphasize that the damage of glaucoma on vision is irreversible. Therefore, if you are a glaucoma patient, please do not be careless, but should be treated regularly and reviewed regularly to avoid regret.